(7) "Purchase" means to acquire, obtain, or receive, or to attempt
to acquire, obtain, or receive, by exchange of money or other
valuable consideration. This term specifically includes barter or
exchange.

"Purchase" means any transaction involving the person from
whom blood is withdrawn, whether he presents himself for the
withdrawal of blood on his own initiative or on the initiative of
another person, in which he receives a monetary consideration in
any form [...]